The example below shows the intended output when using original TeX code
(compiled with ‘context' of TeX Live 2015): a pair of left braced formulas.
The first comment shows what works in AMS-LaTeX.
However, when trying similar ConTeXt commands, I get the error shown in the
comment below. What ConTeXt command might use here?
---
\setupformulas[location=left]
\starttext
\def\equlb#1{\left\{\eqalign{#1}\right.} %equation left braced
% AMS-LaTeX
%\def\equlb#1{\left\{ \begin{aligned} #1 \end{aligned}\right.} % equation left
braced
% ConTeXt error: You can't use `\halign' in math mode.
%\def\equlb#1{\left\{ \startalign #1 \stopalign\right.}
%\def\equlb#1{\left\{ \startmathalignment #1 \stopmathalignment\right.}
\startformula \placeformula[JcoordDef]
J^j:\equlb{ω^0 &→ 0 \cr ω^j &→ 0} \quad
\equlb{ω^k &→ ω^l \cr ω^l &→ -ω^k} \stopformula
\stoptext
---
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